Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
  • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
  • B60K6/08—Prime-movers comprising combustion engines and mechanical or fluid energy storing means
  • B60K6/12—Prime-movers comprising combustion engines and mechanical or fluid energy storing means by means of a chargeable fluidic accumulator
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
  • F16H61/38—Control of exclusively fluid gearing
  • F16H61/40—Control of exclusively fluid gearing hydrostatic
  • F16H61/4078—Fluid exchange between hydrostatic circuits and external sources or consumers
  • F16H61/4104—Flushing, e.g. by using flushing valves or by connection to exhaust
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
  • F15B21/005—Filling or draining of fluid systems
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
  • F15B21/04—Special measures taken in connection with the properties of the fluid
  • F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
  • F16H61/38—Control of exclusively fluid gearing
  • F16H61/40—Control of exclusively fluid gearing hydrostatic
  • F16H61/4078—Fluid exchange between hydrostatic circuits and external sources or consumers
  • F16H61/4139—Replenishing or scavenging pumps, e.g. auxiliary charge pumps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
  • F16H61/38—Control of exclusively fluid gearing
  • F16H61/40—Control of exclusively fluid gearing hydrostatic
  • F16H61/4174—Control of venting, e.g. removing trapped air
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
  • F15B21/04—Special measures taken in connection with the properties of the fluid
  • F15B21/047—Preventing foaming, churning or cavitation
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
  • F15B2211/205—Systems with pumps
  • F15B2211/2053—Type of pump
  • F15B2211/20569—Type of pump capable of working as pump and motor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
  • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
  • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/30—Directional control
  • F15B2211/305—Directional control characterised by the type of valves
  • F15B2211/30505—Non-return valves, i.e. check valves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/60—Circuit components or control therefor
  • F15B2211/61—Secondary circuits
  • F15B2211/613—Feeding circuits
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
  • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
  • F15B2211/7058—Rotary output members
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/80—Other types of control related to particular problems or conditions
  • F15B2211/86—Control during or prevention of abnormal conditions
  • F15B2211/8609—Control during or prevention of abnormal conditions the abnormal condition being cavitation
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/80—Other types of control related to particular problems or conditions
  • F15B2211/88—Control measures for saving energy
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/80—Other types of control related to particular problems or conditions
  • F15B2211/89—Control specific for achieving vacuum or "negative pressure"
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
  • F16H61/38—Control of exclusively fluid gearing
  • F16H61/40—Control of exclusively fluid gearing hydrostatic
  • F16H61/4078—Fluid exchange between hydrostatic circuits and external sources or consumers
  • F16H61/4096—Fluid exchange between hydrostatic circuits and external sources or consumers with pressure accumulators
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/60—Other road transportation technologies with climate change mitigation effect
  • Y02T10/62—Hybrid vehicles

Definitions

• the present invention relates to a hydraulic circuit comprising a booster pump and a purge device, and a hybrid motor vehicle comprising such a hydraulic circuit, and a method for filling and purging this hydraulic circuit.
• the hydraulic circuits generally comprise a pump receiving the fluid from a low pressure part to discharge it in a high pressure part, and store it in a pressure accumulator, in order to supply at least one receiver comprising a return to the low pressure part .
• This type of hydraulic circuit used in industry or for different types of vehicles, in particular for the traction of hydraulic hybrid motor vehicles, may comprise a low pressure part maintained at a minimum pressure by a feeding device, in order to feed the machine. pump at this minimum pressure to prevent cavitation of the fluid, especially with the largest flows.
• a known feeding system presented in particular by the document FR-A1 -2978506, comprises a booster pump collecting the fluid in a tank at atmospheric pressure, whose shaft is connected to that of the high pressure pump to be driven not an electric motor.
• Another booster system that can be used, not consuming electrical energy, comprises a hydraulic motor powered by the high pressure circuit, which rotates a booster pump collecting the fluid in a tank at atmospheric pressure, for the push back into the low pressure circuit.
• this type of circuit comprising a booster pump poses special problems of purging the two high and low pressure circuits, which usually require purging these two circuits, then filling each circuit providing for each its fluid supply . Similarly, during an after-sales intervention requiring a circuit opening, it is then necessary to carry out this purge again.
• the present invention is intended to avoid these disadvantages of the prior art.
• a hydraulic circuit comprising equipment such as a system generating high pressure, a pressure accumulator and a receiver, connected to a high pressure circuit and a low pressure circuit, and a feeding system comprising a pump picking the fluid in a tank for supplying the low pressure circuit in order to maintain a minimum pressure, characterized in that it comprises a vacuum draw means on the high pressure circuit, a communication nonreturn valve disposed between the low circuits. and high pressure allowing a passage to the high pressure, and a blocking means of the pump.
• An advantage of this hydraulic circuit is that in a simple and effective way, by carrying out the vacuum by the drawing means with the pump blocked, at the same time a vacuum is produced in the low pressure circuit which sends its air into the high circuit. pressure through the check valve, the pump blocked preventing a rise of fluid from the tank in this low pressure circuit during vacuum draw.
• the hydraulic circuit according to the invention may further comprise one or more of the following features, which may be combined with one another.
• the vacuum draw means comprises an orifice opening outwards, equipped with a non-return valve allowing passage to the outside.
• the blocking means of the booster pump acts directly on this pump.
• the booster pump can be driven by a hydraulic motor.
• the hydraulic motor is advantageously supplied by the high pressure circuit, and delivers its fluid into the low pressure circuit.
• the blocking means of the pump comprises a lock, a brake or a dog.
• the hydraulic circuit may comprise a powertrain intended to achieve the traction of a motor vehicle.
• the invention also relates to a hybrid motor vehicle comprising a hydraulic circuit having a powertrain provided for the traction of the vehicle, this circuit comprising any one of the preceding characteristics.
• the invention furthermore relates to a method of purging a hydraulic circuit comprising any one of the preceding features, which comprises the following steps, the pump is first blocked with the blocking device, its draw tank being filled, then the vacuum is drawn by the drawing means, and finally this pump is unlocked.
• FIG. 1 is a simplified diagram showing a hydraulic circuit with a booster pump
• FIG. 2 is a simplified diagram showing this hydraulic circuit equipped with the purge device according to the invention.
• FIG. 1 shows a hydraulic circuit intended for the traction of a hybrid vehicle, comprising a high pressure circuit 2 having a gas pressure accumulator 4 which is connected by a solenoid valve 6.
• the high-pressure circuit 2 supplies, via a second solenoid valve 10, a power unit 8 comprising a hydraulic traction machine 12 for the vehicle, which discharges the fluid into a low-pressure circuit 16.
• a safety non-return valve 14 arranged in parallel with the engine hydraulic 12, allows a passage of the fluid only to the high pressure circuit 2.
• the hydraulic machine 12 connected to the drive wheels can operate as a motor by driving the vehicle with a sampling of the fluid from the pressure accumulator 4, or pump by braking the vehicle and charging the accumulator to recover a kinetic energy of the vehicle.
• the hydraulic circuit may comprise other elements not shown, depending on the type of hybrid vehicle, such as a hydraulic pump driven by a heat engine.
• the high pressure circuit 2 also feeds a small power hydraulic motor 18, which directly drives a hydraulic pump 20 drawing the fluid into a tank at atmospheric pressure 22, to discharge it into the low pressure circuit 16 in order to maintain a minimum of pressure to avoid cavitation in this circuit.
• the hydraulic motor 18 delivers its fluid through a pipe 24 into the low pressure circuit 16.
• a pressure limiting valve 26 in the low pressure circuit 16, arranged in parallel with the booster pump 20, comprises a setting spring which opens this valve if the low pressure is clearly too high in order to discharge fluid into the reservoir 22 , which ensures security.
• the two high and low pressure circuits 2, 16 are interconnected by different elements such as the hydraulic motor 18 and the power unit 8, not allowing free passage between these two circuits.
• FIG. 2 shows the same type of hydraulic circuit, furthermore comprising, on the high-pressure circuit 2, a vacuum drawing orifice 30 equipped with an outlet check valve allowing only an exit of the air to evacuate, presented by the arrow F, a communication nonreturn valve 32 disposed between the low circuits 16 and high pressure 2, allowing only a passage from the low to the high pressure, and a blocking device 34 of the pump 20.
• the vacuum draw port 30 may comprise a double seal comprising an airlock which prevents any loss, or a simple seal that may allow a few drops of fluid to leak. As this hole only draws air causing little loss of load, its passage section can be reduced.
• the blocking device 34 of the pump 20 can comprise in particular a latch, a brake or a dog, acting in this example on the axis of the hydraulic motor 18 which is directly connected to that of this pump.
• the locking device 34 could act directly on the pump 20.
• the reservoir 22 comprising filling and emptying holes is kept full after the initial filling performed for the tests in the workshop producing the circuits, the booster pump 20 being blocked, and then it is installed in this state in the vehicle. with the rest of the circuit.
• the pump 20 being blocked with the blocking device 34 and the filling reservoir 22 filled, the vacuum is drawn by the drawing orifice 30 by means of a workshop tool comprising a vacuum pump, the valve of this hole allowing only a passage in this direction.
• the pump 20 is unlocked by acting on the blocking device 34, which allows the vacuum of the two circuits 2, 16 to suck up the fluid coming from the tank 22, passing through this pump which can freely rotate , and by the communication valve 32 to fill the high pressure circuit.
• the pump may have a small leakage flow allowing a little fluid to flow during the drawing of the vacuum, which is not a problem since this pump is immersed, it is sure that it does not suck air .
• the hydraulic circuit can be prepared after the first assembly and the operating tests, leaving the hydraulic pump 20 locked with its reservoir 22 filled with fluid. This limits the number of operations to be performed during the final assembly of the hydraulic circuit in the hybrid vehicle to make it operational.
• this purge process can also be applied to hydraulic circuits used in industry or elsewhere.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Combustion & Propulsion (AREA)
• Transportation (AREA)
• Valves And Accessory Devices For Braking Systems (AREA)
• Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=50102077

Family Applications (1)

Country Status (4)

Families Citing this family (1)

Family Cites Families (5)

• 2013
  • 2013-12-12 FR FR1362525A patent/FR3014965B1/fr not_active Expired - Fee Related
• 2014
  • 2014-11-07 WO PCT/FR2014/052855 patent/WO2015086933A2/fr active Application Filing
  • 2014-11-07 EP EP14806037.9A patent/EP3080487B1/de not_active Not-in-force
  • 2014-11-07 CN CN201480067125.4A patent/CN105813873B/zh not_active Expired - Fee Related

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